Drive motor with a groove cover

ABSTRACT

A drive motor for a suction device or a machine tool in the form of a handheld power tool or a semi-stationary machine tool, wherein the drive motor includes a stator having an excitation coil assembly and a rotor having a motor shaft, which is rotatably mounted around a rotational axis on the stator or with respect to the stator by means of a bearing assembly, wherein the rotor is received in a rotor receptacle of the stator, the inner circumference of said receptacle having grooves which extend along longitudinal axes that run parallel to the rotational axis and have insertion openings which are open towards the rotational axis and are provided for inserting excitation coils of the excitation coil assembly and are closed by groove covers, wherein the groove covers are in engagement with the engage-behind contours of the grooves at their opposite longitudinal sides, each of which extends along the longitudinal axis of the respective groove, said longitudinal axis being transverse to a transverse spacing between the longitudinal sides, and the groove covers have a wall section for covering the groove between the longitudinal sides.

The invention relates to a drive motor for a suction device or a machinetool in the form of a handheld power tool or a semi-stationary machinetool, wherein the drive motor includes a stator having an excitationcoil assembly and a rotor having a motor shaft, which is rotatablymounted around a rotational axis on the stator or with respect to thestator by means of a bearing assembly, wherein the rotor is received ina rotor receptacle of the stator, the inner circumference of saidreceptacle having grooves which extend along longitudinal axes that runparallel to the rotational axis in particular and have insertionopenings which are open towards the rotational axis and are provided forinserting excitation coils of the excitation coil assembly and areclosed by groove covers, wherein the groove covers are in engagementwith the engage-behind contours of the grooves at their oppositelongitudinal sides, each of which extends along the longitudinal axis ofthe respective groove, said longitudinal axis being transverse to atransverse spacing between the longitudinal sides, and the groove covershave a wall section for covering the groove between the longitudinalsides, wherein the engage-behind contours support the groove covertowards the rotational axis and hold the groove cover in the respectivegroove. The invention furthermore relates to a method for arranging sucha groove cover on such a drive motor.

Motors with such groove covers are explained, for example, in U.S. Pat.No. 6,713,927 B2 or DE 38 90 737 C2. The groove covers are typicallydesigned in the form of flexurally rigid rods which are pushed into thegrooves from the respective end faces or longitudinal end regions of thestator. The further the groove cover is inserted into the groove, thegreater the frictional resistance. The groove covers must be designed tobe correspondingly flexurally rigid.

It is therefore the object of the present invention to provide animproved drive motor.

To achieve the object, it is provided in a drive motor of the typementioned at the outset that the transverse spacing of the longitudinalsides of at least one groove cover can be modified such that the groovecover can be inserted into the groove past the engage-behind contours ofthe groove in a movement direction radial to the rotational axis of therotor and can be brought into behind engagement with the engage-behindcontours of the groove.

The methods provides for:

introducing at least one groove cover into the rotor receptacle andmoving the groove cover into the groove in a movement direction radiallyto the rotational axis of the rotor, with the transverse spacing of thelongitudinal sides of the groove cover being modified in such a way thatthe groove cover engages behind the engage-behind contours of the groovepast the engage-behind contours of the groove into the groove and on thelongitudinal sides.

The gripping-behind contours extend, for example, directly at the edgesof the insertion opening and, so to speak, reduce its insertion crosssection.

The groove cover preferably has a longitudinal shape with a longitudinalaxis. When the groove cover is arranged in the groove, the longitudinalaxes of the groove and the groove cover run parallel to one another.Thus, when reference is made to a longitudinal axis of the groove, thelongitudinal axis of the groove cover can also be addressed at the sametime.

A basic idea here is that the groove cover is, so to speak, insertedinto the groove from the interior of the rotor receptacle so that itlocks in the groove, for example. Assembly is much simpler than, forexample, when a groove cover is introduced frontally, as is customary inthe prior art. The groove cover can also be designed to be significantlyless flecturally rigid in its longitudinal direction, for example,because it does not have to be loadable along its longitudinal axis fora plugging movement. Rather, flexural flexibility or resilience is evenpreferred, in particular transversely to the longitudinal axis of thegroove or groove cover.

For example, the wall section of the groove cover is designed as aflexurally flexible section or has such a flexurally flexible section,wherein the flexurally flexible section can be deformed in terms ofreducing the transverse spacing of the longitudinal sides of the groovecover transversely to the longitudinal axis or a narrowing of the groovecover transversely to the longitudinal axis. Thus, the longitudinalsides or longitudinal flanks of the groove cover can be deformed towardsone another in order to reduce the transverse spacing between thelongitudinal sides and thus enable introduction into the insertionopening of the groove.

The groove cover advantageously forms a locking body which can beinserted into the groove in a movement direction radially with respectto the rotational axis of the drive motor and can be locked in theengage-behind contours. The locking function is possible, for example,on the basis of the flexurall flexible section already mentioned.However, it is also possible for locking contours to be present on theside of the groove cover, for example spring-loaded locking bodies orthe like, which can engage with the formfitting contours of the groove.At this point it should be mentioned that a flexible configuration of atleast one wall section or another part of the groove cover is preferred.In principle, however, it is conceivable that the groove cover comprisesa wall body that is inherently fixed transversely to the longitudinalsides or with regard to the transverse spacing, but on the longitudinalsides of which there are flexible parts. In principle, a telescopicgroove cover would also be conceivable, which has telescopic sections interms of reducing and enlarging the transverse spacing of itslongitudinal sides.

It is advantageous if the groove forms a tension body or clamping bodythat can be tensioned with the groove, which is tensioned or clampedwith the groove in a state of being received in the groove. For example,the groove cover is supported on side walls of the groove that extend inthe direction of the longitudinal axis.

It is furthermore advantageous if the groove cover is tensioned with thegroove in the state of being received in the groove transversely to thelongitudinal axis in terms of increasing the transverse spacing.

The groove cover, for example its wall section, preferably has anarched, curved or barrel-shaped cross section transversely to thelongitudinal axis or its longitudinal extension. Such an arched orcurved cross section enables a particularly simple displacement ordeformation of the wall section in terms of reducing and then enlargingthe transverse spacing between the longitudinal sides. The groove coverhas the arched and/or curved and/or barrel-shaped cross sectionadvantageously in a state inserted into the groove and/or in a state notinserted into the groove and/or in the unloaded state and/or beforeinsertion into the groove and/or without a force acting on it. Thegroove cover has, for example, its greatest length in its longitudinalextension. The cross section of the groove cover extends, for example,between narrow sides or long sides of the groove cover. The groove coverpreferably has a bulge or curvature between its narrow sides or longsides.

It is preferred if the groove cover as a whole, but preferably the wallsection, is curved into an interior space of the groove or away from therotational axis. Thus, the groove cover does not protrude into the rotorreceptacle rather bulges away from it, so to speak. As a result, thefreedom of movement for the rotor is not restricted. In principle,however, the reverse configuration is also conceivable, in that thebulge of the groove cover is oriented towards the rotational axis of therotor.

Only low joining forces are required to introduce the groove cover intothe groove. In particular, the introduction of the groove cover into thegroove is facilitated, for example, by a flexibility transverse to thelongitudinal extent or longitudinal axis of the groove cover and/or bythe insertion bevel or displacement contour of the groove coverexplained below.

Furthermore, an insertion bevel or displacement contour isadvantageously provided on the groove cover, which is suitable forinserting the groove cover into the insertion opening of the groove. Theinsertion bevel makes it easier to insert the groove cover into thegroove. The displacement contour is advantageously suitable fordeforming the groove cover in terms of reducing the transverse spacingbetween its longitudinal sides.

The insertion bevel or displacement contour is, for example, an inclinedsurface, a bulged surface or the like. In particular, the alreadymentioned bulged outer contour of the wall section can represent or formthe insertion bevel or displacement contour.

When a force is applied to the groove cover in the radial direction withrespect to the rotational axis into the insertion opening of the groove,the insertion bevel or displacement contour expediently brings about aforce on the groove cover in terms of reducing the transverse spacingbetween the longitudinal sides of the groove cover. The groove cover isthus, so to speak, deformed into a narrower shape by the application offorce brought about by the insertion bevel or displacement contour.

The groove advantageously has at least one support contour forsupporting the groove cover in a direction of force radially outwardwith respect to the rotational axis. For example, the support contour isopposite the at least one engage-behind contour. The support contour andthe engage-behind contour can form, for example, a V-shaped or U-shapedconfiguration. For example, the support contour is, so to speak, thesupport contour that supports towards the bottom of the groove. Theengage-behind contour acts in a supporting manner during or against amovement of the groove cover out of the groove or prevents the groovecover from moving out of the groove.

In principle, it is possible for the support contour and theengage-behind contour to be provided on mutually opposite sides, forexample a formfitting projection that protrudes into the interior of thegroove.

The at least one engage-behind contour and/or the at least one supportcontour are preferably designed as, in particular, planar or flatsupport surfaces or resting surfaces or stop surfaces.

The groove cover has an engage-behind surface associated with theengage-behind contour of the groove .

If the groove provides a support contour, the groove cover has a supportsurface associated with it for support on the support contour.

It is advantageous if the support surface of the groove cover isdesigned as an insertion bevel or displacement contour for inserting thegroove cover into the insertion opening of the groove.

The support contour and/or the engage-behind contour and/or the supportsurface and/or the engage-behind surface are advantageously planar orflat surfaces. However, it is also possible for one or more of theaforementioned contours or surfaces to have a bulge. The support contourand the engage-behind contour preferably directly adjoin one another.The support contour and the engage-behind contour are advantageously atan angle, in particular at an obtuse angle. The support contour and theengage-behind contour advantageously enclose an angle, in particular anobtuse angle.

The support contour and the engage-behind contour are preferablyopposite one another.

The support surface and the engage-behind surface of the groove coverare preferably at an angle, in particular at an obtuse angle, to oneanother and/or directly adjoin one another. The support contour and/orengage-behind contour are preferably facing away from one another.

On at least one longitudinal side of the groove cover, preferably onboth longitudinal sides, a formfitting projection for engaging aformfitting receptacle of the groove or a formfitting receptacle forengaging a formfitting projection of the groove is arranged. That is tosay both is possible, that the groove has a formfitting projection thatengages in a formfitting receptacle of the groove cover or, conversely,that the groove cover has a formfitting projection that engages in aformfitting receptacle of the groove, as shown by the example in thedrawing. Formfitting projections or formfitting receptacles arepreferably provided on the mutually opposite longitudinal sides of thegroove cover, but it is also possible for a formfitting projection to bepresent on one longitudinal side of the groove cover and a formfittingreceptacle on the other longitudinal side.

The groove has a formfitting receptacle for the formfitting projectionof the groove cover, and a formfitting projection for the formfittingreceptacle of the groove cover, that is to say, for example opposingformfitting projections or formfitting receptacles or one formfittingprojection and one formfitting receptacle opposite one another.

The engage-behind contour of the groove and/or the support contour ofthe groove are/is preferably provided on the respective formfittingprojection or the formfitting receptacle of the groove.

It is also advantageous if the engage-behind surface and/or thesupporting-surface are/is provided at the formfitting projection or theformfitting receptacle of the groove cover.

A section of the formfitting projection that protrudes furthest definesthe transverse spacing between the longitudinal sides of the groovecover. Preferably, the groove cover has one formfitting projection eachon opposite longitudinal sides, the most protruding sections of whichdefine the transverse width of the groove cover or the transversespacing of the longitudinal sides.

Preferably, the at least one formfitting projection or the at least oneformfitting receptacle of the groove cover can be moved transversely tothe longitudinal axis in the direction of a transverse center in termsof reducing the transverse spacing between the longitudinal sides of thegroove cover. This can be implemented, for example, in that the wallsection of the groove cover is flexurally flexible.

The formfitting projection or the formfitting receptacle preferablyextends over the entire length of the groove cover and/or the groovewith respect to the longitudinal axis.

Otherwise, however, a segmented construction would also be possible,that is, for example, with respect to the longitudinal axis, two or moreformfitting projections or formfitting receptacles are arranged next toone another, but at a longitudinal spacing from one another.

The formfitting projection and the formfitting receptacle are preferablycomplementary to one another. The formfitting projection therefore fitsinto the respective formfitting receptacle. In the case of theformfitting projection and the formfitting receptacle, a U-shaped orV-shaped cross sectional contour or shape is advantageous. It ispreferred if the side flanks of the formfitting projection and theformfitting receptacle have a large angular spacing of, for example, atleast 90 degrees from one another.

It is also advantageous if there is a spacing or free space between thegroove cover and the coil conductors, which are arranged in the groove.

It is advantageously provided that the groove cover is not designed tohold and/or support coils or coil conductors of the stator coil assemblyreceived in the groove. If, for example, a coil or a coil conductor actson the groove cover in terms of removal, the groove cover yields and/oris released from the groove.

It is also advantageous if the engage-behind contour and/or aengage-behind surface of the groove cover has, or is designed as, arelease bevel for support on the at least one engage-behind contour ofthe groove, which when force is applied to the groove cover in theradial inside direction with respect to the rotational axis, acts on thegroove cover in terms of releasing the groove cover from the grooveand/or in terms of deforming the groove cover in terms of narrowing. If,for example, a coil or a coil conductor of the stator coil assembly actson the groove cover and/or exerts a force in terms of removing from thegroove, the engage-behind contour or the engage-behind surface or both,engage-behind contour and engage-behind surface, act in terms ofreleasing the groove cover from the groove. For example, the groovecover becomes narrower due to the release bevel or release bevels, sothat it comes out of the groove and/or a form fit between the groovecover and the groove is eliminated.

It is advantageous if the engage-behind contour of the groove and the ora engage-behind surface of the groove cover abutting against theengage-behind contour are designed as sealing surfaces whichadvantageously abut flat against one another. It is also advantageous ifthe support contour of the groove and the or a support surface of thegroove cover abuting against the support contour are designed as asealing surface, which advantageously abut flat against one another. Inparticular, the support contour and the engage-behind contour, as wellas the support surface and the engage-behind surface of the groove coverabuting against it, form a sealing profile.

The wall section of the groove cover preferably forms a base leg of thegroove cover, from which at least one lateral leg protrudes at an angle,which runs parallel to the longitudinal axis and engages one of theengage-behind contours of the groove. Lateral legs of this type arepreferably arranged on opposite sides of the base leg.

A free end region of the at least one lateral leg or the lateral legs ispreferably oriented or inclined towards the wall section, so that aformfitting projection for engaging in a formfitting receptacle of thegroove is formed in a transition region between the wall section and thelateral leg. The formfitting projection is therefore located on thelongitudinal outer sides or longitudinal sides of the groove cover.

The groove cover expediently forms a wall body or profile body or isformed thereby.

For example, the groove cover is made of plastic, in particular ofpolyamide. The groove cover can be fiber-reinforced, in particular glassfiber-reinforced. Fibers of the fiber reinforcement preferably runparallel or essentially parallel to the longitudinal axis of the groovecover or the groove.

It is advantageous if the groove cover is obtained by a roll materialunwound from a coil, which is deformed into a linear elongated form andsevered from the roll material. Unwinding a roll material from a coiland severing a length of the roll material to provide the at least onegroove cover is therefore preferred. It may be necessary to first bringthe roll material into an elongated linear shape before it is introducedinto the groove. For this purpose, a smoothing device, for examplecomprising pressing elements, heating devices or the like, is preferablyprovided.

It is possible that the groove cover is only seated in the groove with aclamping fit or tension fit. However, it is also possible that thegroove cover is firmly bonded to the groove, for example glued, weldedor the like.

An advantageous concept provides that the groove cover is fixed, inparticular welded, to at least one longitudinal end region of the statorby a bearing cover that closes the stator frontally. For example, thebearing cover has a receptacle in which a section of the groove cover,in particular protruding in front of the stator or its carrier package,is received. It is also possible that when welding, gluing or otherwisefirmly bonding the bearing cover to the stator, a material of thestator, in particular of a carrier body on which the laminated core ofthe stator is arranged, melts and bonds with the groove cover.

A magnet assembly arranged on the rotor comprises magnets, in particularpermanent magnets.

For example, magnet bodies of the magnets which are magnetized orsuitable for magnetization on the laminated core of the rotor consist ofaluminum-nickel-cobalt, Bismanol, thus an alloy made up of bismuth,manganese, and iron, of a ferrite, for example a hard-magnetic ferrite,for example based on barium, strontium, of neodymium-iron-boron (NdFeB),advantageously with an additive of dysprosium, of samarium-cobalt(SmCo), advantageously having 20-25% iron component, e.g., SmCo₅,Sm₂Co₁₇, Sm(Co,Cu,Fe,Zr)_(z), or the like. Rare-earth magnets or plasticmagnets are also suitable. Furthermore, AINiCo alloys, PtCo alloys,CuNiFe and CuNiCo alloys, FeCoCr alloys, martensitic steels, or MnAICalloys are suitable for the magnet bodies.

The drive motor is preferably a brushless motor or electronicallycommutated motor. In particular, it is advantageous if the respectivestator of the drive motor includes permanent magnets or is excited bypermanent magnets.

Laminated cores of the rotor and/or the stator are preferably producedfrom layered electrical sheets or transformer sheets.

A stator of the drive motor expediently comprises a carrier body made ofplastic, in particular made of polyamide. The carrier body is produced,for example, by potting and/or extrusion coating the laminated core ofthe stator. It is also possible that the carrier body comprises one ormore plug bodies or plug carrier bodies, which are plugged onto thelaminated core. For example, such a plug carrier body can be pluggedonto one or both end sides of the laminated core. The carrier bodypreferably covers the laminated core in the region of the rotorreceptacle and/or in the region of one or both end sides of thelaminated core. Supports, support projections, winding heads, and thelike for accommodating coil conductors of the excitation coil assemblyare preferably provided on the carrier body. Furthermore, the carrierbody preferably includes electrical connecting contacts or connectingunits for connecting a connecting line, using which the drive motor isconnectable or connected to an energizing unit.

Exemplary embodiments of the invention are explained hereinafter on thebasis of the drawings. In the figures:

FIG. 1 shows a perspective diagonal illustration of a system of twoelectric drive motors and hand-held power tools which include thesedrive motors,

FIG. 2 shows a side view of the one drive motor of the system accordingto FIG. 1, of which in

FIG. 3 a section is shown along a section line A-A FIG. 2,

FIG. 4 shows a section through the other drive motor of the systemaccording to FIG. 1, approximately along the same section line A-Acorresponding to FIG. 2,

FIG. 5 shows an insulation sleeve of the drive motor according to FIG. 4in a perspective illustration,

FIG. 6 shows a perspective illustration of a rotor of the drive motoraccording to FIG. 4,

FIG. 7 shows a sectional illustration through the rotor according toFIG. 6 during its production, approximately along a section line B-B inFIG. 6,

FIG. 8 shows the view approximately corresponding to FIG. 7, wherein themotor shaft is inserted completely into the rotor laminated core,however,

FIG. 9 shows a detail D1 from FIG. 8,

FIG. 10 shows a perspective diagonal view of the stator according toFIG. 1, approximately corresponding to a detail D2 in FIG. 1,

FIG. 11 shows a section along a section line C-C through the statoraccording to FIG. 10 to illustrate a connecting unit, which in

FIG. 12 is shown laterally in the open state and in

FIG. 13 is shown laterally in the closed state,

FIG. 14 shows a perspective illustration of the connecting unitaccording to FIG. 12, and

FIG. 15 shows a perspective illustration of the connecting unitaccording to FIG. 13,

FIG. 16 shows a perspective diagonal illustration to illustrate aninstallation and processing of the connecting unit according to FIGS. 10to 14 in a perspective diagonal illustration, approximatelycorresponding to FIG. 10 with a welding gun,

FIG. 17 shows a section through the arrangement according to FIG. 16approximately along a section line D-D,

FIG. 18 shows the image according to FIG. 17, but with welding gun armsmoved toward one another,

FIG. 19 shows a detail D3 of the stator according to FIG. 1 with agroove cover, which in

FIG. 20 is shown diagonally in perspective,

FIG. 21 shows a detail D4 from FIG. 19 during an installation of thegroove cover according to FIG. 17 in a stator groove,

FIG. 22 shows detail D4, but with groove cover adjusted further in thestator groove, and

FIG. 23 shows detail D4 with fully installed groove cover,

FIG. 23B shows alternative embodiments of a groove cover and a groove,approximately corresponding to the view according to FIG. 23,

FIG. 24 shows a schematic illustration of an installation unit forproducing the groove cover according to FIG. 19 and its installation onthe stator according to FIGS. 21 to 23,

FIG. 25 shows a perspective diagonal view of a detail of a rotor of theabove-mentioned motor, approximately corresponding to a detail D5 inFIG. 6, and

FIG. 26 shows a schematic illustration of a balancing unit for balancingthe rotor according to the above figure, and

FIG. 27 shows a schematic frontal view of the rotor according to theabove figure with a magnetizing device.

FIG. 1 shows a system illustration comprising a hand-held power tool300, for example a saw, in which a drive motor 20 drives a toolreceptacle 301 for a working tool, for example directly or via a gearing(not visible in the drawing). A working tool 302, for example a cuttingtool, sawing tool, or the like is arrangeable or arranged on the toolreceptacle 301. The drive motor 20 is accommodated in a housing 303 ofthe power tool 300 and can be switched on and switched off by means of aswitch 304. A speed of the drive motor 20 is preferably also adjustableusing the switch 304.

A connecting cable 305 for connection to a power supply grid EV is usedfor the electrical power supply of the hand-held power tool 300. Thepower supply grid EV provides a supply voltage P1, for example 110 V ACvoltage, 230 V AC voltage, or the like. The hand-held power tool 300 caninclude an energizing unit 306 connected between the switch 304 and thedrive motor 20.

The drive motor 20 can also be provided to operate a suction device 400,in particular to drive a suction turbine of the suction device 400. Thesuction device 400 includes the drive motor 20 and is connectable, forexample, by means of a connecting cable 405 to the power supply grid EV.

The voltage P1 is in any case significantly greater, for example atleast four times to five times greater, than a voltage P2, which anenergy accumulator 205 of a hand-held power tool 200 provides. Thevoltage P2 is, for example, a DC voltage of 14 V, 18 V, or the like.

The hand-held power tool 200 is, for example, a power screwdriver,drill, or the like. A drive motor 120, which is suitable for the lowervoltage P2, is accommodated in a housing 203 of the hand-held power tool200. The drive motor 120 is energized by an energizing unit 206, whichis supplied with electrical energy by the energy accumulator 205. Thedrive motor 120 drives a tool receptacle 201 for a working tool 202, forexample a drilling tool or screwing tool, directly or via a gearing 208.The energizing unit 206 can be switched on, switched off, and/ordesigned for adjusting a speed of the drive motor 120 by way of a switch204.

The drive motors 20, 120 include partially identical or similarcomponents.

For example, motor shafts 30 and 130 alternately usable in the drivemotors 20, 120 each include bearing portions 31, 32, between which aholding portion 33 is provided. The bearing portion 32 is locatedadjacent to an output portion 34, which is used to drive the toolreceptacle 201 or 301. For example, a gearwheel can be arranged orarrangeable on the output portion 34. Alternatively, gear teeth 35 areprovided as indicated in the case of a motor shaft 130. The holdingportion 33 preferably includes a formfitting contour 36, which extendsbetween planar portions 37, which thus do not include a formfittingcontour.

The formfitting contour 36 comprises, for example, grooves and/orprojections 36A extending in parallel to a longitudinal axis L of themotor shaft 30. However, a fluting, a honeycomb-like structure, or thelike can also be provided as the formfitting contour 36.

A formfitting contour 136 of the motor shaft 130 comprises, for example,formfitting projections 136A inclined obliquely to the longitudinal axisL. The formfitting projections 136A have a slight oblique inclination,however, for example between 5 and 15°, so that the formfittingprojections 136A extend essentially in parallel to the longitudinal axisL.

The formfitting contours 36, 136 form, for example, formfitting contours36B, 136B.

The output portion 34 can be provided to drive a fan wheel. For example,a fan wheel holder 38 is provided on the motor shaft 130, which isarranged, for example, between the gear teeth 35 and the bearing portion32.

The motor shaft 30 or 130 is connectable in a rotationally-fixed mannerto a laminated core 41 or 141 of a rotor 40, 140. The laminated cores41, 141 include sheets 43 arranged adjacent to one another in a seriesarrangement transverse to the longitudinal axis L, for exampleelectrical sheets or transformer sheets, in a way known per se.

The laminated cores 41, 141 include shaft through-openings 42, 142,which have different diameters. The shaft through-opening 42 has alarger diameter than the shaft through-opening 142. The motor shaft 30or 130 can be inserted by means of an insulation sleeve 60 into theshaft through-opening 42, while the motor shafts 30 or 130 can beinserted directly into the shaft through-opening 142, i.e., aninsulation sleeve or similar other body is not necessary.

The insulation sleeve 60 forms an insulation body 60A, by means of whichthe laminated core 41 is electrically insulated from the respectivemotor shaft 30 or 130 carrying it.

Magnet assemblies 50 are arranged on the laminated cores 41 and 141. Thelaminated cores 41 or 141 include holding receptacles 45 for magnets 50of the magnet assemblies 50. For example, four holding receptacles 45and associated magnets 51 are provided, so that the rotor 40, 140 formsa total of four magnetic poles. The magnets 51 are, for example,permanent magnets.

The magnets 51 have, for example, a plate-shaped design. The magnets 51,for example, magnet plates or plate bodies 56. The holding receptacles45 are accordingly suitable for accommodating plate-shaped, thus flatrectangular, cubic plate bodies or magnet plates and includecorresponding inner circumferential contours.

The holding receptacles 45 and the magnets 51 extend in parallel to thelongitudinal axis L of the motor shaft 30, 130 or in parallel to therotational axis D of the motor 20, 120.

Furthermore, the rotor 40, in particular as the laminated core 41, 141,is penetrated by air ducts 46, which extend in parallel to thelongitudinal axis L of the motor shaft 30, 130 and are open at the endsides 44 of the rotor 40, 140, so that air can flow through thelaminated cores 41, 141.

The shaft through-opening 42, 142 does have an essentially circularinner circumferential contour, but advantageously additionally also hasa twist-lock contour 47, in particular a twist-lock receptacle 47A. Thetwist-lock contour 47 is, for example, a longitudinal groove 47B, whichextends in parallel to the rotational axis D or longitudinal axis L.

Both motor shafts 30, 130 can each be inserted into the laminated cores41, 141.

In the laminated core 141, the shaft through-opening 142 of which has asmaller diameter than the shaft through-opening 42 of the otherlaminated core 41, the respective motor shaft 30, 130 can be inserteddirectly into the shaft through-opening 142, for example pressed in.

The narrow sides or end sides of the sheets 43, which delimit the innercircumference of the shaft through-opening 42 or protrude into it,advantageously claw together with the motor shaft 30, 130, so that it isaccommodated non-displaceably in the laminated core 141 in a firstdirection parallel to the rotational axis D or to its longitudinal axisL. An electrical conductivity of the laminated core 141 and the motorshaft 30, 130, which preferably consists of metal, is possible in spiteof the direct contact between the laminated core 141 and the motor shaft30, 130, because the rotor 140 is provided for use with the drive motor120 and thus for the lower voltage P2.

In contrast, insulation measures are taken in the rotor 40, so that inspite of the electrical conductivity of the motor shaft 30, 130 and ofthe associated laminated core 41, electrical safety is provided.

Specifically, the motor shaft 30, 130 is accommodated by means of aninsulation sleeve 60 in the laminated core 41. The insulation sleeve 60thus more or less forms a protective jacket or an outer envelope of themotor shaft 30, 130 in the section which is accommodated in the shaftthrough-opening 42.

The insulation sleeve 60 includes a tube portion 63 between itslongitudinal ends 61, 62, which is arranged in a sandwiched mannerbetween the laminated core 41 and the motor shaft 30, 130 andelectrically insulates it from the laminated core 41.

The tube portion 63 includes a socket 64 for inserting through the motorshaft 30, 130, which extends from the longitudinal end 61 to thelongitudinal end 62. In the region of the longitudinal end 61, thesocket 64 has an insertion opening 64A, through which the motor shaft 30is insertable into the socket 64. The motor shaft 30 exits from thesocket 64 at an exit opening 64B.

In the region of the longitudinal end 61, i.e., a longitudinal endregion 61A, the socket 64 has a larger diameter W1 and thus a largerinner cross section WQ1 than in the region of the longitudinal end 62,i.e., a longitudinal end region 62A, where a smaller diameter W2 andthus a smaller inner cross section WQ2 is provided. For example, thediameter of the motor shaft 30, 130 is approximately 10 mm in the regionof the longitudinal ends 61, 62. In contrast, the diameter W2 is smallerby approximately 0.2 mm to 0.3 mm than the diameter W1 before the motorshaft 30, 130 is inserted into the socket 64. Thus, when the motor shaft30, 130 is inserted along an insertion axis S into the insulation sleeve60 from the longitudinal end 61 to the longitudinal end 62, as indicatedin FIG. 7, it first penetrates slightly or with transverse play withrespect to the insertion axis S into the insertion opening 64A at thelongitudinal end 61, where the socket 64 has the diameter W1. Thediameter W1 is advantageously somewhat larger than the diameter of themotor shaft 30, 130 at its free longitudinal end provided to be insertedinto the socket 64. The region of the insertion opening 64A forms acentering section, in which the motor shaft 30, 130 is centered withrespect to the insulation sleeve 60 or the rotational axis D. Forexample, the motor shaft 30 has the same outer cross section or outerdiameter both in the region of the diameter W1 and also in the region ofthe diameter W2.

Alternatively or additionally, it is possible that, for example, themotor shaft 30 includes a first outer cross section AQ1 and a secondouter cross section AQ2, which are associated with the longitudinal ends61, 62 of the socket 64, wherein the first outer cross section AQ1 issmaller than the second outer cross section AQ2. In this design of themotor shaft 30, it is also possible that the diameters W1 and W2 andthus the inner cross sections of the socket 64 are identical orapproximately equal in the region of the longitudinal ends 61 and 62.

The socket 64 becomes narrower from the diameter W1 to the diameter W2,preferably continuously, between the longitudinal ends 61, 62. However,it would also be possible that at least one step is provided between thediameter W1 and the diameter W2. The socket 64 advantageously includes aplug cone, which becomes narrower from the longitudinal end 61 to thelongitudinal end 62.

Insertion bevels 65, for example an insertion cone, are advantageouslyprovided at the longitudinal end 61 in order to facilitate the insertionprocess of the motor shaft 30, 130 into the socket 64.

When the motor shaft 30, 130 is inserted along the insertion axis S intothe socket 64, it penetrates further and further in the direction of thelongitudinal end 62, wherein it more or less widens the tube portion 63,which becomes narrower toward the longitudinal end 62.

The installation is structured as follows:

First the insulation sleeve 60 is inserted into the shaftthrough-opening 42 of the laminated core 41.

It is advantageously provided that the insertion cross section or innercross section of the shaft through-opening 42 is equal or approximatelyequal over its entire length provided for the insertion of theinsulation sleeve 60.

However, it is also possible that the shaft through-opening 42 has alarger inner cross section at a longitudinal end region 41A provided forinserting the insulation sleeve 60 than at a longitudinal end region 41B opposite to this longitudinal end region.

The motor shaft 30, 130 is then inserted into the socket 64. Therefore,when is inserted along the insertion axis S into the socket 64, themotor shaft 30, 130 presses the radial outer circumference of the tubeportion 64 in the direction of the radial inner circumference of theshaft through-opening 42. The sheets 43 preferably engage with theirnarrow sides facing toward the shaft through-opening 42 like teeth intothe circumferential wall 66.

The socket 64 has the narrower diameter W2 up into a region in front ofthe laminated core 41, so that the motor shaft 30, 130, when it reachesthis region of the socket 64, then widens the circumferential wall 66 ofthe tube portion 63 radially outward with respect to the insertion axisS and thus more or less stretches the tube or the tube portion 63. Aformfitting section 75 having a step 67 thus forms on the outercircumference of the circumferential wall 63, which directly engages inor engages behind the end side 44 of the laminated core 41. The step 63thus holds the insulation sleeve 60 with a force direction opposite tothe insertion direction, in which the motor shaft 30, 130 is insertableinto the socket 64, on the laminated core 41. At the other longitudinalend region, the longitudinal end 61, the insulation sleeve 63 includes aflange body 68, which protrudes radially outward from the tube portion63 with respect to the insertion axis S or the longitudinal axis L.

The flange body 68 forms a longitudinal stop 68A with respect to theinsertion axis S and is supported, for example, on the end side 44 ofthe laminated core 41 in the region of the longitudinal end 61. Theflange body 68 includes, for example, reinforcing ribs 69, which extendfrom its radial circumference in the direction of the socket 64, i.e.,radially inward toward the insertion axis S. The reinforcing ribs 69 arearranged, for example, on an end side 71 of the flange body 68 facingaway from the laminated core 41.

Furthermore, a support stop 70 for the motor shaft 30, 130 is providedon the insertion opening 64A, on which a support stop 39, for example astep, of the motor shaft 30, 130 can strike with a force directionparallel to the insertion axis S. The support stop 70 is formed, forexample, by a step between the end side 71 of the insulation sleeve 60and the socket.

The insulation sleeve 60 preferably has a smaller outer circumference ordiameter in the region of the longitudinal end 62 or on the outletopening 64B than in the region of the longitudinal end 61. For example,insertion bevels 72 are provided on the longitudinal end 62, whichfacilitate the insertion of the insulation sleeve 60 into the shaftthrough-opening 42 of the laminated core 41. The longitudinal end 62 isdesigned, for example, as an insertion projection.

Preferably, the insulation sleeve 60 protrudes at the longitudinal end62 with a tube portion 73 forming an insulation portion 76 from the endside 44 of the laminated core 41, so that electrical insulation isprovided there between the motor shaft 30, 130, on the one hand, and thesheets 43, on the other hand.

In contrast, at the other longitudinal end 61, the flange body 68, whichmore or less protrudes or projects laterally from the shaftthrough-opening 42, ensures electrical insulation and also forms aninsulation portion 76. Therefore, for example, an electrical insulationdistance of, for example, approximately 8 mm to 10 mm, for example anair and creep distance, which is capable of electrical insulation withrespect to the voltage P1, results both in the region of the flange body68 and also on the tube portion 73.

A twist-lock contour 74 to engage in the twist-lock contour 47 of thelaminated core 41 is preferably arranged on the radial outercircumference of the insulation sleeve 60, in particular over the entirelongitudinal extension of the tube portion 63. The twist-lock contour 74is designed, for example, as a twist-lock projection 74A, in particularas a longitudinal projection or a longitudinal rib 74B, which extends inparallel to the insertion axis S or rotational axis D.

The insulation sleeve 60 is accommodated in a clamp fit or press fitbetween the motor shaft 30, 130 and the laminated core 41. A frictionlock is thus implemented.

In addition, a form fit is also provided by the twist-lock contours 47,74, by means of which the insulation sleeve 60 is held in a formfittingmanner on the laminated core 41 with respect to and/or transversely tothe rotational axis D.

The formfitting contour 36, 136 of the motor shaft 30, 130 engages liketeeth in the inner circumference of the tube portion 63, so that themotor shaft 30, 130 is also accommodated in the insulation sleeve 60twist-locked with respect to its rotational axis D or longitudinal axisL and/or displacement-fixed with respect to the rotational axis D or thelongitudinal axis L. The formfitting contour 36, 136 advantageouslyforms a counter formfitting contour on the inner circumference of thetube portion 36, thus, for example, plastically deforms the innercircumference of the tube portion 63, so that the formfitting contour36, 136 is engaged in a formfitting manner with this counter formfittingcontour. The plastic deformation or embossment of the counterformfitting contour results or forms, for example, during the insertionof the motor shaft 30, 130 into the insulation sleeve 60.

The insulation sleeve 60 thus enables the motor shafts 30, 130, whichcan be inserted directly without additional measures into the laminatedcore 141, to also be readily usable with the laminated core 41.Different motor shafts thus do not have to be constructed. The motorshafts 30, 130 are geometrically identical at the holding portions 33,which are provided for the connection to the laminated cores 41 or 141.For example, length and diameter of the holding portions 33 areidentical. However, it is possible that different surfaces and/orsurface contours are provided in the region of the holding portions 33of the motor shaft 30 and 130 for the respective optimum hold of thelaminated core 41 or 141.

Buttress projections 43A protruding in the shaft through-opening 42 or142 preferably penetrate into the radial outer circumference of the tubeportion 63 of the insulation sleeve 60 or the radial outer circumferenceof the holding portion 33 of the motor shaft 30, 130. For example,formfitting sections 75A, thus, for example, formfitting receptacles75B, form on the insulation sleeve 60, in which the buttress projections43A engage, schematically indicated in FIG. 5. The radial outercircumference of the tube portion 63 is displaced radially outward withrespect to the insertion axis S or the rotational axis D, for example,by the motor shaft 30, wherein the buttress projections 43A penetrateinto the tube portion 63 and preferably claw themselves therein.

The buttress projections 43A are provided, for example, on the end sidesof the sheets 43 facing toward the shaft through-opening 42 or 142.Intervals, for example angular intervals and/or longitudinal intervals,are preferably provided between the buttress projections 43A, inparticular between groups of buttress projections 43A, with respect tothe rotational axis D. The buttress projections 43A hold the insulationsleeve 60 in the shaft through-opening 42 or the motor shaft 30, 130 inthe shaft through-opening 142 in parallel to the rotational axis Dand/or in the circumferential direction with respect to the rotationalaxis D. Multiple buttress projections 43A are preferably provided atangular intervals around the rotational axis D. The insulation sleeve 60is displaced radially outward by the motor shaft 30 inserted therein, sothat the buttress projections 43A penetrate, in particular penetrate ina claw-like manner, into the outer circumference or the jacket or thecircumferential wall 66 of the insulation sleeve 60.

The rotors 40, 140 of the drive motors 20, 120 can be used together witha stator 80, which includes an excitation coil assembly 86. Theexcitation coil assembly 86 can include differently designed excitationcoils 87, for example excitation coils 87 having more or fewer turns,having different conductor cross sections, or the like, in order to besuitable for the different voltages P1 and P2 and/or amperages ofcurrents which flow through the excitation coils 87.

The stator 80 includes a laminated core 81 having a rotor receptacle 82designed as a through-opening for the rotor 40, 140. The rotor 40, 140is rotatably accommodated in the rotor receptacle 82, wherein a narrowair gap is provided in a way known per se between the laminated core 81and the laminated core 41, 141.

The laminated core 81 includes sheets 83, for example electrical sheetsor transformer sheets, the plate plane of which extends transversely tothe rotational axis D of the drive motor 20, 120. The respective motorshaft 30, 130 protrudes from end sides 84, 85 of the laminated core 81,where it is rotatably mounted on bearings 24, 25 of a bearing assembly24A.

The bearings 24, 25 are held on bearing receptacles 23 by bearing covers21, 22, which frontally close the stator 80.

The bearings 24, 25 can be inserted, in particular pressed, into thebearing receptacles 23 of the bearing covers 21, 22. However, it is alsopossible that the bearings 24, 25 are extrusion coated or potted usingthe material of the bearing covers 21, 22.

For example, the bearing covers 21, 22 are permanently connected to thelaminated core 41 or a carrier body 90 carrying the laminated core 41,for example screwed on, adhesively bonded, or preferably welded.

The bearing covers 21, 22 and the carrier bodies 90 are preferably madeof plastic, in particular of a thermoplastic. The same plastic, forexample the same thermoplastic, is preferably used for the bearingcovers 21, 22 and the carrier bodies 90.

For example, the carrier body 90 is produced in a casting method, duringwhich the laminated core 81 is potted.

The carrier body 90 includes bearing cover receptacles 91 for thebearing covers 21, 22. For example, circumferential walls 26 of thebearing covers 21, 22 are insertable, for example with their end sides,into the bearing cover receptacles 91.

The bearing cover 21 is arranged closer to the output portion 34 of themotor shaft 30, 130. The bearing cover 22 on the region more remotetherefrom. The bearing covers 21, 22 close the laminated core 81 onlongitudinal end regions opposite to one another. The bearing cover 21protrudes less from the end side of the laminated core 41, 141 than thebearing cover 22. The bearing cover 21 includes a receptacle space 21Afor the flange body 68.

The bearing 24 is closer to the potentially current-conducting laminatedcores 41, 81 than the bearing 25.

The bearing 24 and the bearing 25 are electrically conductivelyconnected to the bearing portion 31 and thus the motor shaft 30, 130, sothat as such the hazard exists that a voltage from the excitation coilassembly 86 will jump over to the motor shaft 30, 130.

However, a sufficient electrical insulation distance is provided by theelectrically insulating flange body 68, so that this hazard no longerexists.

The bearing 25, in contrast, has a greater longitudinal distance withrespect to the rotational axis D to the end side of the laminated cores41, 81, so that the hazard of an electrical flashover from, for example,the excitation coil assembly 86 to the motor shaft 30, 130 also does notthreaten here in the region of the bearing 25. Moreover, theelectrically insulating tube portion 73 of the insulation sleeve 60,which protrudes from the laminated core 41 in the direction of thebearing cover 22, ensures sufficient electrical insulation.

The coil conductors 88 of the excitation coils 87 extend in thelaminated core 81 through grooves 89, which are arranged, for example,in parallel to the rotational axis D or obliquely inclined thereto. Thegrooves 89 have insertion openings 89D, which are open to an innercircumference 82A of the rotor receptacle 82. The grooves 89 extendbetween the end sides 84, 85. The coil conductors 88 can be introducedinto the grooves 89 through the insertion openings 89D and, for example,wound around winding heads or winding hammers of the laminated core 81.

The portions of the laminated core 81 facing toward the rotor receptacle82 of the stator 80, which are located between the grooves 89, arecovered by an inner lining 92, for example extrusion coated usingplastic, but the grooves 89 are initially open, so that the coilconductors 88 can be laid therein.

The excitation coils 87 are furthermore wound around support projections93 on the end side 84 of the stator 80, which more or less form windingheads.

On the opposite end side 85, support projections 94 are provided, whichare also suitable for wrapping with coil conductors of excitation coils,but in some embodiments are not wrapped.

The end side 85 more or less represents the connection side of the drivemotor 20, 120. Electrical connecting units 100 are provided there, towhich, for example, connecting lines 15 for the electrical connection tothe energizing unit 206, 306 are connectable or connected. Theconnecting lines 15 include a plug connector for plugging onto anenergizing unit 206, 306. The connecting units 100 can also be referredto as terminals.

The connecting lines 15 can, for example, be plugged onto the connectingunits 100 or also directly soldered thereon. The connecting units 100include, for example, connecting contact regions 101 designed as contactprojections, on which connecting plugs, which are connected to theconnecting lines, can be plugged on. Furthermore, holes 102 are providedon the connecting contact regions 101, through which, for example, aconnecting conductor of the connecting lines 15 can be led through andsoldered to the connecting unit 100 or electrically connected in anotherway. For example, welding of such a connecting conductor to theconnecting unit 100 would also be readily possible.

The connecting units 100 can be arranged using a plug installation onthe carrier body 90. The carrier body 90 includes holders 95 for theconnecting units 100. The holders 95 comprise sockets 96, into which theconnecting units are insertable. The sockets 96 are provided betweenreceptacle projections 97, which protrude from the end side 85 of thecarrier body 90. For example, the receptacle projections 97 have grooves98 opposite to one another, into which insertion projections 104protruding laterally from the connecting units 100 are insertable, forexample like a tongue-and-groove connection.

The insertion projections 104 protrude laterally from a base body 103 ofa respective connecting unit 100. The insertion projections 103 protrudetransversely to the longitudinal extension of the connecting contactregion 101 from the base body 103. The insertion projections 104 and theconnecting contact region 101 overall form an approximately T-shapedconfiguration. For example, the base body 104 more or less forms a baseleg, from which the insertion projections 104 protrude laterally likelateral legs. However, the base planes of the insertion projections 104and the base body 103 are different. A transition section 106, whichincludes, for example, S-shaped curves or arc sections or curves or arcsections opposite to one another, is provided between the base body 103and the insertion projections 104. Therefore, the insertion projections104 thus protrude from a rear side 115 of the base body 103.

At the free end regions protruding from the base body 103, the insertionprojections 104 have formfitting contours 105, in particular gear teeth105A, barbs, or the like, using which a formfitting hold in the socket96 is possible. The insertion projections 104 can preferably more orless claw into the socket 96 of the carrier body 90 by means of theformfitting contours 105. In particular, melting of the carrier body 90in the region of the sockets 96, in particular the grooves 98, uponheating of the connecting unit 100, which is also described hereinafter,has the result that a formfitting connection is established, on the onehand, between the insertion projections 104, in particular theformfitting contours 105 thereof, and, on the other hand, the materialof the carrier body 90 in the region of the socket 96, in particular inthe region of the grooves 98.

The gear teeth 105A include, for example, an interlacing, i.e., forexample, a tooth 105B protrudes from the insertion projectiontransversely to the main plane of the insertion projection 104.

The connecting units 100 include conductor receptacles 107 foraccommodating the respective portion of a coil conductor 88 to beconnected. The conductor receptacles 107 are formed between, on the onehand, the front side 114 of the base body 103 and, on the other hand, areceptacle arm 108 of the connecting unit 100, which is connected bymeans of a connection portion 109 to the base body 103. In particular,it is advantageous if the base body 103, the connection portion 109, andthe receptacle arm 108 are integral. The lateral legs or insertionprojections 104 of the base body 103 are preferably also integral withit. An inside of the connection portion 109 facing toward the conductorreceptacle 107 forms a receptacle section or a receptacle trough 116A ofthe conductor receptacle 107.

The conductor receptacle 107 includes a support surface 107A and anarrow side 1078 angled thereto in the region of the receptacle trough116A. An oblique surface 107C obliquely inclined to the support surface107A and to the narrow side 107B for supporting the at least one coilconductor 88 is arranged between the narrow side 107B and the largesupport surface 107A. The oblique surface 107C can be, for example, achamfer, a curved or arched surface, or the like. In any case, theoblique surface 107C prevents the coil conductor 88 from resting on asharp edge.

The connecting unit 100 is advantageously embodied as a stamped-bentpart, which is first stamped out of a base material and then broughtinto the above-described form by corresponding shaping.

The installation and/or fastening and/or electrical contacting of thecoil conductor 88 in the conductor receptacle 107 is structured asfollows:

The conductor receptacle 107 is initially open, specifically in that thereceptacle arm 108 still protrudes far from the base body 103, see, forexample, FIGS. 12 and 14. The coil conductor 88 can move down to thebottom 116, i.e., the inner circumference of the connection portion 109,of the conductor receptacle 107, see, for example, FIG. 12. However,this configuration is rather undesired, so that the coil conductor 88 isheld in a position remote from the bottom 116 of the conductorreceptacle 107 by additional support measures, for example by a support251 of an installation unit 250.

However, the configuration is preferably made so that the carrier body90 includes a support contour 99, on which the coil conductor 88 issupported during the installation or during the closing of theconnecting unit 100, see FIGS. 10 and 11. The coil conductor 88 thusrests on the support contour 99, so that it does not touch the bottom116. The support contour 99 is provided, for example, on an outside ofthe receptacle projections 97 facing away from the grooves 98. Forexample, the support contour 99 is embodied as a step between therespective receptacle projection 97 and the section of the carrier body90 from which the receptacle projection 97 protrudes.

The position of the coil conductor 88 raised off of the bottom 116 isadvantageous for the following closing and welding operation. It isadvantageous in particular if coil conductors having smaller crosssection are used, for example a coil conductor 88B (FIG. 11). This coilconductor 88B can then itself have a distance from the bottom 116, whichheats up significantly during the welding process described hereinafter,if the receptacle arm 108 is moved toward the base body 103, so that itpresses with its free end 113 against the front side 114 of the basebody 103.

The coil conductor 88B forms, for example, a component of an excitationcoil 87B of an excitation coil assembly 86B.

The receptacle arm 108 has a closing leg 111, which protrudes at anangle from a middle arm portion 110 of the receptacle arm 108, on itsend region facing away from the connection portion 109. For example, acurved portion or connection portion 112 is provided between the middlearm portion 110 and the closing leg 111. The closing leg 111 protrudesfrom the middle arm portion 110 in the direction of the front side 114of the base body 103, so that its free end 113 touches the front side114 in the closed state of the conductor receptacle 107, while adistance, which defines the conductor receptacle 107, is providedbetween the middle arm portion 110 and the front side 114 of the basebody 103.

A welding gun 252 of the installation unit 250 is used for closing theconnecting units 100 and welding. The welding gun 252 includes gun arms253, 255, on the free end regions of which, which are provided for thecontact with the connecting unit 100, support surfaces 254, 256 areprovided. The free end regions of the gun arms 253, 255, which areprovided to engage with the connecting unit 100, taper to a point, thusform points 257. In particular in the case of the gun arm 253, which hasa supporting effect with its support surface 254 on the rear side 115 ofthe connecting unit 100, this pointed, narrow design of the gun arm 253is advantageous.

The gun arms 253, 254 are arranged in a V shape, so that the points 257engage from sides opposite to one another on the connecting unit 100(see FIG. 16), close it, and subsequently weld it.

Longitudinal axes L1, L2 of the gun arms 253, 255 preferably extend atan angle W, in particular approximately 20° to 40°. Thus, in particularthe point 257 of the gun arm 253 can enter the intermediate spacebetween bearing cover 22 and rear side 115 of the connecting unit 100and support the base body 103 there with its support surface 254.

The gun arm 254 acts in terms of closing the conductor receptacle 107 onthe receptacle arm 108. For example, the curved portion112 pressesagainst the support surface 256 of the gun arm 255. The support surfaces254, 256 are oriented in parallel or essentially in parallel to oneanother when the support surface 254 moves toward the support surface256, which is shown as the feed movement VS in the drawing. Therefore,the gun arm 253 thus remains stationary and supports the connecting unit100 on the rear side, while the gun arm 255 adjusts the receptacle arm108 in the direction of the base body 103. Its free end 113 of itsclosing leg 111 then comes into contact with the front side 114 of thebase body 103 of the connecting unit 100. The conductor receptacle 107is therefore closed and a receptacle eye 119A is formed.

It is also possible that a welding gun or similar other milling devicereshapes the receptacle arm 108 from an initially elongated, linearshape, in which the closing leg 111 is not yet formed, for example, intoa receptacle arm 108 having closing leg 111, for example on the basis ofa schematically indicated deformation contour 259 on the gun arm 255.

The gun arms 253, 255 are then energized by an energizing unit 258 inthat the gun arms 253, 255 have different potentials and thus generate acurrent flow through the connecting unit 100.

The welding current IS flows through the more or less ring-shaped closedconnecting unit 100, i.e., through the sections of the connecting unit100 which close the conductor receptacle 107, namely the base body 103in the region of the conductor receptacle 107 and the receptacle arm108. The welding current IS flows via connection regions 118 and 119,namely, on the one hand, via the connection portion 109, but also, onthe other hand, via a contact region 117 between the free end 113 of theclosing leg 111 and the front side 114 of the base body 103. A largeamount of heat occurs both in the contact region 117 and also in theregion of the bottom 116, which does not damage the coil conductors 88or 88B, however, because they have a distance to the bottom 116, butalso to the upper contact region 117. Nonetheless, the connecting unit100 becomes sufficiently hot in the region of the conductor receptacle107 that a paint or other similar insulation of the coil conductors 88melts and they come into electrical contact with the surfaces of theconnecting unit 100.

The connecting unit 100 is therefore more or less mechanically closedand subsequently welded to those coil conductors 88 which areaccommodated in the conductor receptacle 107. The installation is, onthe one hand, protective for the coil conductors 88, but, on the otherhand, also reliable and highly durable, namely because the coilconductors 88 can be somewhat mechanically changed by theabove-mentioned pressing process and the welding process, but are notweakened or changed in their cross sectional geometry in such a way thatthey break, for example, during the operation of the drive motor 20,120.

When the excitation coils 87 are inserted in the grooves 89, they areclosed by groove covers 180.

The groove covers 180 include a profile body 181. The groove covers 180preferably consist of plastic and/or an electrically insulatingmaterial. The profile body 181 is embodied, for example, as a plasticpart or plastic wall body.

The profile body 181 forms a wall body 182 which more or less representsa closure wall for a respective groove 89.

The groove cover 180 or the profile body 181 has a long design andextends along a longitudinal axis L8, which extends in parallel to alongitudinal axis L9 of the groove 89, when the groove cover 180 isinstalled in the groove 89. Longitudinal narrow sides or long sides 195of the groove cover 180 extend along the longitudinal axis L8. Thelongitudinal sides 195 have a transverse distance Q transversely to thelongitudinal axis L8.

Longitudinal end regions 183 of the groove cover 180 preferably protrudefrom the laminated cover 81 up to the carrier body 90, so thatelectrical insulation is provided over the entire length of a groove 89.Adhesive bonding, welding, or similar other fastening on one or both ofthe bearing covers 21 or 22 is advantageous there, for example.

The groove cover 181 includes a wall section 184, which completelycovers the groove 88 transversely to the longitudinal axis L8. The wallsection 184 is approximately U-shaped or arched in cross section, thustransversely to the longitudinal axis L8, and forms formfittingprojections 186 on its transverse end regions, thus transversely to thelongitudinal axis L8, which are provided to engage in formfittingreceptacles 89B of the grooves 89. Transversely to the longitudinal axisL8, the groove cover 180 includes two formfitting receptacles 186, whichform sections of the groove cover 180 protruding farthest transverselyto the longitudinal axis L8 and/or are opposite to one another. Theformfitting projections 186 and the formfitting receptacle 89B formformfitting contours 185, 89A, which hold the groove cover 180 in thegroove 89 transversely to the longitudinal axis L8, which simultaneouslyrepresents the longitudinal axis of the groove 89.

The wall section 184 forms a trough -shaped formation between theformfitting contours 185, and thus has a bottom 187. The bottom 187 is,for example, bulging into the respective groove 89, thus extendstherein. Of course, a reverse configuration would also be possible, inwhich the wall section 184 does not protrude radially outward withrespect to the rotational axis D, but rather radially inward. However,it would possibly be in the way of the rotor 40, 140 there.

Lateral legs 188 extend away from the wall section 184. The lateral legs188 are inclined toward one another, i.e., their free end regions remotefrom the wall section 184 are inclined toward one another. The laterallegs 188 and the wall section 184 in the transition region to thelateral legs 188 thus form the formfitting contour 185, which isV-shaped in a side view, thus a formfitting projection 186.

The installation of the groove cover 180 is structured as follows:

As such, it would be possible to insert the groove cover 180 into arespective groove 89, for example, from one of the end sides 84 or 85,i.e., along an insertion axis which extends in parallel to therotational axis D. However, the formfitting contours 185 are movabletoward one another transversely to the longitudinal axis L8, so that atransverse distance Q between the formfitting contours 185 can bereduced, so that the groove cover 180 can be pushed into the groove 89past a side edge 89C of the groove 89, see FIGS. 21 to 23 in thisregard. In this case, the wall section 184 slides with its roundedoutside 189, thus on its side opposite to the bottom 187, which thusforms a displacement contour 189A, past the side edges 89C, wherein thewall section 184 yields flexibly, in this regard thus forms a flexiblesection 194. At the same time, the lateral legs 188 and the formfittingcontours 185 are moved toward one another in terms of narrowing thetransverse distance Q and finally at the end of this insertion movementSB, the groove cover 180 locks in the groove 89, i.e., the formfittingcontours 185 engage with the formfitting contours 89A.

The groove cover 180 is then accommodated in a formfitting manner in thegroove 89, namely in two directions orthogonal to one anothertransversely to the longitudinal axis L8.

A surface of the formfitting receptacle 89B facing away from the rotorreceptacle 82 forms an engage-behind contour 89E. A surface of theformfitting receptacle 89B facing toward the rotor receptacle 82 forms asupport contour 89F.

The engage-behind contour 89E and/or the support contour 89F arepreferably planar.

The engage-behind contour 89E and/or the support contour 89F preferablysupport the groove cover 180 over its entire longitudinal axis L8.

The lateral legs 188 include engage-behind surfaces 188A, which aresupported on the engage-behind contour 89E. Sections of the wall portion184 adjoining the lateral legs 188 include support surfaces 188B or formthese support surfaces, which are supported on the support contours 89F.Therefore, the engage-behind contours 89A support the groove cover 180in the direction of the interior of the rotor receptacle 82 or therotational axis D and the support contours 89F in opposition thereto,thus in the direction radially outward with respect to the rotationalaxis D or a bottom of the respective groove 89.

The advantage of this construction method also results in that, forexample, the carrier body 90 can protrude somewhat radially inward inthe direction of the rotor receptacle 82 at the longitudinal end regionsof the groove 89 when the groove covers 180 are installed. This isbecause the longitudinal end regions 183 thereof can then be broughtinto engagement behind in the direction of the rotor receptacle 82 ofthe protruding section of the carrier body 90.

Furthermore, the engage-behind surfaces 188A and the engage-behindcontours 89E as well as the support surfaces 188B and the supportcontours 89F press flatly against one another, so that a sealed seat ora seal of the groove 89 is implemented and/or the groove cover 180 sealsclosed the groove 89.

The groove covers 180 advantageously have a seal function for sealingoff the grooves 89, but no support function for the excitation coils 87of the excitation coil assembly 86. The oblique inclination of theengage-behind contours 89E and the engage-behind contours 188A rathereven acts in terms of a release bevel, which, upon an application offorce to the groove cover 180 in a direction out of the groove 89 orradially inward with respect to the rotational axis D, causes adeformation or narrowing of the groove cover 180 and thus facilitates orenables its release from the groove 89.

An alternative exemplary embodiment according to FIG. 23B, which is onlyschematically shown, provides, for example, a groove 489 designedalternatively to the groove 89, into which a groove cover 480 isintroduced. The groove cover 480 includes formfitting receptacles 486 onits longitudinal narrow sides, which are engaged with formfittingprojections 489B of the groove 489. The formfitting projections 489B areopposite to one another. The formfitting receptacles 486 and theformfitting projections 489B are complementary to one another, forexample V-shaped.

Surfaces of the formfitting projections 489B facing away from the rotorreceptacle 82 form engage-behind contours 489E. Surfaces of theformfitting projections 489B facing toward the rotor receptacle 82 formsupport contours 489F. The engage-behind contour 489E and/or the supportcontour 489F are preferably planar. The engage-behind contour 489Eand/or the support contour 489F preferably support the groove cover 480over its entire longitudinal axis L8. The long sides of the groove cover480 or the formfitting receptacles 486 include engage-behind surfaces488A, which are supported on the engage-behind contours 489E. Theformfitting receptacles 486 furthermore include support surfaces 488B orform these support surfaces, which are supported on the support contours489F.

The mechanical structure of the stator 80 is preferably entirely orpartially identical for both voltage levels P1 and P2. In particular,the rotor receptacle 82 for the rotor 40, 140 is identical, thus, forexample, has the same diameter. The design of the grooves 89, thus, forexample, their formfitting contours 89A and/or their width and/or depthare also identical. It is also advantageous if the groove cover 180 isusable or used on the stator 80 independently of whether the excitationcoil assembly 86 is designed and/or arranged for the voltage P1 or thevoltage P2. An extensive equivalent part principle is thusimplementable.

It is possible to provide the groove covers 180 as individual profileparts, i.e., that they already have the elongated design shown in FIG.20 and have lengths corresponding to the length of the groove 89.

However, one advantageous embodiment provides that the groove covers 180are obtained from a roll material 190. The roll material 190 isprovided, for example, as a coil 191. The coil 191 is rotatablyaccommodated on a coil carrier 273, for example, in particular acorresponding holding stand. An unwinding device 274 unwinds the rollmaterial 190 from the coil 191.

A portion 192 of the roll material 190 unwound from the coil 191 passesthrough, for example, a roll assembly 275 having one or more rolls, inparticular deflection rolls or guide rolls.

Downstream of the roll assembly 275, a smoothing unit 276 is provided,in which the portion 192 is smoothed, so that its originally roundedformation on the coil 191 is transferred into an elongated formation.The smoothing unit 276 comprises, for example, at least one pressingelement 277, in particular pressing elements 277 opposite to oneanother, and/or a heating device 278 having heating bodies 279, in orderto bring the roll material 190 of the portion 192 into an elongatedformation, as shown in FIG. 20. The roll material 190 is thus brought bythe smoothing unit 276 into a linear elongated shape.

A cutting unit 280 adjoins the smoothing unit 276, using which a lengthis cut to length in each case from the portion 192, which corresponds toa desired groove cover 180, thus, for example, the length of thelaminated core 81 or the carrier body 90. The cutting unit 280 includes,for example, cutting elements 281, in particular cutters, blades, sawingelements, or the like.

It is to be noted at this point that instead of the laminated core 181or stator 80, other, i.e., shorter or longer stators can be providedwith groove covers by means of the installation unit 270. Respectivesuitable groove covers 180 are thus produced as needed, the length ofwhich is adapted to the length of the stator to be equipped. The cuttingelement 280, for example a blade cutter, thus cuts off a groove cover180 in each case from the portion 192, which is then grasped by aholding element 271 and inserted in the stator 80.

The holding element 271, for example a gripper, comprises holding arms272, which can grasp the profile body 181 or the groove cover 180 on itslongitudinal end regions 183 and can insert it into the groove 89 bymeans of the insertion movement SB. It would readily be possible thatthe holding element 271 includes a suction unit or similar holdingelement, which suctions on the groove cover 180 in the region of thebottom 187 and inserts it with a force component generating theinsertion movement SB into the groove 89.

It can thus be seen that by inserting, joining, pressing and the like,essential components of the motor 20, 120 are to be produced, namely,for example, the connecting units 100, the cover of the grooves 89 bymeans of the groove covers 180.

The magnetization described hereinafter of the magnets 51 also followsthis installation concept.

This is because the magnets 51 are initially not yet magnetized duringthe installation on the rotor 40, 140 or laminated core 41, 141. Amagnetizable material 51A of a respective magnet body 56 is thusinitially not magnetic when the magnet body 52, which is not yetmagnetic as such, is inserted or pressed in the context of an insertionprocess or pressing process into one of the holding receptacles 45. Themagnetizable material 51A is, for example, neodymium-iron-boron (NdFeB),advantageously with an additive of dysprosium, or samarium-cobalt(SmCo).

For example, support projections 48 are provided on the holdingreceptacles 45, which support narrow sides 54 of a respective magnetbody 52. The narrow sides 54 extend in parallel to the rotational axis Din the state of the magnets 50 installed on the rotor 40, 140. Themagnet bodies 52 or magnets 51 are preferably clamped between thesupport projections 48.

Flat sides 53 having larger areas than the narrow sides 54 extendbetween the narrow sides 54. Normal directions of the flat sides 53 arepreferably radial to the rotational axis D.

The laminated cores 41, 141 include holding projections 49 for holdingthe magnet bodies 52. The holding projections 49 protrude, for example,toward the flat sides 53 and press with their free end regions againstthe flat sides 53. It is preferred if the holding projections 49 more orless claw together and/or form buttress projections with the magnet body52.

The sheets 43 of the laminated cores 41, 141 comprise sheets 43 whichhave recesses 59A in a predetermined angular position with respect tothe rotational axis D. The recesses 59A preferably extend radially withrespect to the rotational axis D away from one of the flat sides of therespective holding receptacle 45, for example radially inward toward therotational axis D. It is preferred if the recesses 59A are arranged insuccession in an axial line in parallel to the rotational axis D, thusare aligned with one another. Some of the sheets 43 have holdingprojections 59 protruding into the recesses. The holding projections 59furthermore protrude into the insertion cross section of a respectiveholding receptacle 45, so that upon insertion of a magnet body 52 into aholding receptacle 45, they engage with the magnet body 52 and are bentover by the magnet body 52 in an insertion direction SR, in which themagnet body 52 is inserted into the holding receptacle 45. A holdingprojection 59 can be displaced here into the recess 59A of one or moreadjacent sheets 43. An end side of a respective holding projection 59,which is the width of a narrow side of a sheet 43, is then supportedobliquely inclined on the flat side 53 of the magnet body 52 andprevents the magnet body 52 from being pulled out of the holdingreceptacle 45 against the insertion direction SR.

The magnet bodies 52 or magnets 51 are preferably accommodated in theclamp fit in the holding receptacle 45. Of course, adhesive bonding,welding, or similar other installation would be entirely possible. Themagnetizable material 51A is thus inserted into the respective laminatedcore 41, 141 in the not yet magnetized state.

The rotor 40, 140 is then balanced by means of a balancing unit 285. Inthis case, the motor shaft 30, 130 and possibly the insulation sleeve 60is already installed. Therefore, the rotor 40, 140 can thus be rotatedby means of the motor shaft 30, 130 around its rotational axis D bymeans of a motor 286. A measuring unit 287 establishes, for example,imbalances of the rotor 40, 140.

Still existing imbalances are then remedied in that, for example, atleast one balancing section 55 is produced, for example, by means of amaterial-reducing unit 288, for example a grinding unit, a milling unit,or the like. In this case, for example, material of the laminated core41, 141 is removed where balancing is necessary, wherein chips, metaldust, or the like result. However, this is not problematic since themagnet bodies 52 are not yet magnetized when the material of thelaminated core 41, 141 is machined. The chips, dust, or the like whichresult due to removal of the sheets 43 do not magnetically adhere to thelaminated core 41, 141, so that they are easily removable. During thelater operation of the drive motor 20, 120, no metal chips or dust arethus present, which can damage, for example, the bearings 24 or 25.

It is advantageous if the balancing sections 55 are attached to thoseregions of the laminated core 41, 141 where the laminated core 41, 141has the greatest possible material thickness or thickness in the radialdirection with respect to the rotational axis D, i.e., in particular onthe radial outside with respect to the magnets 51. Thus, for example, ifan imbalance U occurs at a region unfavorable for producing a balancingsection, vectorial balancing is preferred in which the imbalance U isdecomposed into force vectors Ux and Uy and, for example, balancingsections 55x and 55y are produced corresponding to these vectors by thematerial-reducing device 288 on the radial outside on the laminated core41, 141. The balancing sections 55x and 55y are located, for example,radially outside on the laminated core 41, 141 from holding receptacles55, which are arranged at an angular interval in relation to theimbalance U directly adjacent thereto.

In the rotor 40, 140, no balancing bodies or balancing weights arenecessary on the end sides 44. Thus, for example, the inflow openingsand outflow openings of the air ducts 46 are not covered by balancingweights or balancing bodies. Furthermore, air can also flow laterallypast the magnets 51, namely through air ducts 46A, which are provided onthe holding receptacles 45 or are provided by the holding receptacles45. The inflow openings and outflow openings of the air ducts 46A arealso not covered by balancing weights or balancing bodies.

A cleaning unit 289, for example a blowing unit, a brushing unit, and/ora vacuum cleaner or the like, can readily remove the metallic particlesresulting during the material removal by the material-reducing unit 288from the rotor 40, 140, in particular the respective laminated core 41,141, as long as the magnet bodies 52 are not magnetic. For example, thecleaning device 289 generates an air jet LU, which removes chips and thelike from the region of the balancing section 55.

When the rotor 40, 140 is balanced, it is magnetized by means of amagnetizing unit 290, i.e., in particular the magnet bodies 52 aremagnetically activated. The magnetizing unit 290 includes, for example,magnetizing heads 291A, 291 B, 291C, 291 D.

For example, the magnetizing unit 290 comprises a positioning unit 292,which positions, in particular pivots, the motor shaft 30, 130 in such away that the magnets 51 are exactly opposite to the magnetizing heads291 at the correct angle.

The rotor 40, 140 is advantageously positioned by means of a mechanicalcoding 57 with respect to the magnetizing heads 291A, 291B, 291C, 291Din such a way that one magnetizing head 291A, 291 B, 291C, 291 D isarranged in each case between adjacent magnets 51.

For example, the twist-lock contour 74 is used as the coding 57, whichstrikes on a stop 293, for example, in particular a rotational stop, ofthe magnetizing device 290, so that the rotor 40, 140 is arranged at thecorrect rotational angle with respect to the magnetizing heads 291. Thestop 293 is shown in conjunction with the balancing unit 285. However,other components of the rotor 40 can readily be used as the coding 57,for example the air ducts 46, which can engage in corresponding stops ofthe magnetizing unit 290 and/or which are optically acquirable. Anoptical acquisition of the rotational angle position of the rotor 40,140 is advantageously also possible, for example by a camera or similarother optical sensor of the magnetizing unit 290.

The magnetizing heads 291A, 291 B, 291C, 291 D generate magnetic fieldsMFA, MFB, MFC, MFD, which penetrate the magnet bodies 52 or magnets 51arranged adjacent to one another at an angular interval with respect tothe rotational axis D so that they are permanently magnetized and formmagnetic poles, which are indicated as north poles N and south poles S.The magnetic fields MFA, MFB, MFC, MFD are indicated in dashed fieldlines having errors corresponding to the magnetic flux direction in thedrawing.

When the magnets 51 of the rotors 40, 140 are magnetized, the rotors 40,140 are installed on the stator 80.

It is obvious that multiple magnet bodies 52 or magnets 51 are alsoarrangeable in the holding receptacles 45 for the magnets 51, forexample a series arrangement of two or more magnet bodies 52 are magnets51 in parallel to the rotational axis D. Magnetizing of the respectivemagnet bodies 52 is also readily possible in this case when they arealready accommodated in the holding receptacles 45.

In the case of the magnetizing by the magnetizing device 290, it is alsoadvantageous that the sheets 43 of the laminated cores 41, 141 aremagnetically conductive, so that they can optimally conduct the magneticfields 292 of the magnetizing device 290 through the magnet bodies 52.

1. A drive motor for a suction device or a machine tool in the form of ahandheld power tool or a semi-stationary machine tool, wherein the drivemotor includes a stator having an excitation coil assembly and a rotorhaving a motor shaft, which is rotatably mounted around a rotationalaxis on the stator or with respect to the stator by means of a bearingassembly, wherein the rotor is received in a rotor receptacle of thestator, the inner circumference of said receptacle having grooves whichextend along longitudinal axes that run parallel to the rotational axisand have insertion openings which are open towards the rotational axisand are provided for inserting excitation coils of the excitation coilassembly and are closed by groove covers, wherein the groove covers arein engagement with the engage-behind contours of the grooves at theiropposite longitudinal sides, each of which extends along thelongitudinal axis of the respective groove , said longitudinal axisbeing transverse to a transverse spacing between the longitudinal sides,and the groove covers have a wall section for covering the groovebetween the longitudinal sides, wherein the engage-behind contourssupport the groove cover towards the rotational axis and hold the groovecover in the respective groove and wherein the transverse spacing of thelongitudinal sides of at least one groove cover can be modified suchthat the groove cover can be inserted into the groove past theengage-behind contours of the groove in a movement direction radially tothe rotational axis of the rotor and can be brought into behindengagement with the engage-behind contours of the groove at thelongitudinal sides of the cover.
 2. The drive motor as claimed in claim1, wherein the wall section of the groove cover has or forms aflexurally flexible section which can be deformed in terms of reducingthe transverse spacing of the longitudinal sides of the groove covertransversely to the longitudinal axis or a narrowing of the groovecover.
 3. The drive motor as claimed in claim 1, wherein, the groovecover forms a locking body, which can be inserted into the groove in themovement direction radially with respect to the rotational axis of thedrive motor and can be locked in the engage-behind contours.
 4. Thedrive motor as claimed in claim 1, wherein the groove cover forms atension body that can be tensioned with the groove or a clamping bodythat is clamped in the groove and/or is tensioned with the groove in thestate of being received in the groove transversely to the longitudinalaxis in terms of increasing the transverse spacing.
 5. The drive motoras claimed in claim 1, wherein the groove cover has an arched or curvedcross section transversely to the longitudinal axis, and/or the groovecover, is bulged into an interior of the groove and/or away from therotational axis.
 6. The drive motor as claimed in claim 1, wherein thegroove cover has an insertion chamfer and/or displacement contour forinserting the groove cover in the insertion opening of the groove. 7.The drive motor as claimed in claim 6, wherein the insertion chamfer ordisplacement contour, when force is applied to the groove cover in theradial direction with respect to the rotational axis into the insertionopening of the groove, causes a force on the groove cover by reducingthe transverse spacing of the longitudinal sides of the groove cover. 8.The drive motor as claimed in claim 1, wherein the groove has at leastone support contour, for supporting said groove cover in a direction offorce radially outward with respect to the rotational axis.
 9. The drivemotor as claimed in claim 1, wherein a formfitting projection forengaging in a formfitting receptacle of the groove or a formfittingreceptacle for engaging a formfitting projection of the groove isarranged at at least one longitudinal side of the groove cover.
 10. Thedrive motor as claimed in claim 9, wherein the formfitting projection orthe formfitting receptacle extends over the entire length of the groovecover and/or the groove with respect to the longitudinal axis.
 11. Thedrive motor as claimed in claim 9, wherein the formfitting projectionand the formfitting receptacle are complementary to one another and/orV-shaped or U-shaped.
 12. The drive motor as claimed in claim 1, whereinthe wall section forms a base leg of the groove cover, from which atleast one lateral leg protrudes at an angle, and which runs parallel tothe longitudinal axis and engages one of the engage-behind contours ofthe groove.
 13. The drive motor as claimed in claim 12, wherein a freeend region of the at least one lateral leg is oriented towards the wallsection so that a formfitting projection for engaging in a formfittingreceptacle of the groove is formed in a transition region between thewall section and the lateral leg.
 14. The drive motor as claimed inclaim 1, wherein the at least one groove cover has a wall body orprofile body or is formed thereby.
 15. The drive motor as claimed inclaim 1, wherein the at least one groove cover is obtained by a rollmaterial unwound from a coil, which is deformed into a linear elongatedform and severed from the roll material.
 16. The drive motor as claimedin claim 1, wherein the groove cover is fixed by a bearing coverfrontally closing the stator at least one longitudinal end region of thestator.
 17. The drive motor as claimed in claim 1, wherein the at leastone engage-behind contour of the groove and/or the or a support contourof the groove supporting in a force direction opposite the engage-behindcontour is designed as a support surface or a resting surface or a stopsurface or comprises such a surface.
 18. The drive motor as claimed inclaim 1, wherein the groove cover has at least one engage-behind surfacefor support on the at least one engage-behind contour of the grooveand/or at least one support surface for support on a support contour ofthe groove supporting in a force direction opposite the engage-behindcontour.
 19. The drive motor as claimed in claim 1, wherein at least oneengage-behind contour and/or a engage-behind surface of the groove coverfor support on the at least one engage-behind contour of the groove hasa release bevel or is designed as a release bevel which, when force isapplied to the groove cover in the radial inside direction with respectto the rotational axis, acts on the groove cover in terms of byreleasing the groove cover from the groove and/or by deforming thegroove cover by of narrowing.
 20. The drive motor as claimed in claim 1,wherein said engage-behind contour of the groove and an engage-behindsurface of the groove cover abutting against it and/or a support contourof the groove and a support surface of the groove cover abutting againstit, are designed as sealing surfaces and/or form a sealing profileand/or abut against one another in terms of sealing the groove.
 21. Amethod for arranging a groove cover on a drive motor for a suctiondevice or a machine tool in the form of a handheld power tool or asemi-stationary machine tool, wherein the drive motor includes a statorhaving an excitation coil assembly and a rotor having a motor shaft,which is rotatably mounted around a rotational axis on the stator orwith respect to the stator by means of a bearing assembly, wherein therotor is received in a rotor receptacle of the stator, the innercircumference of said receptacle having grooves which extend alonglongitudinal axes that run parallel to the rotational axis in particularand have insertion openings which are open towards the rotational axisand are provided for inserting excitation coils of the excitation coilassembly and are closed by groove covers, wherein the groove covers arein engagement with the engage-behind contours of the grooves at theiropposite longitudinal sides, each of which extends along thelongitudinal axis of the respective groove, said longitudinal axis beingtransverse to a transverse spacing between the longitudinal sides, andthe groove covers have a wall section for covering the groove betweenthe longitudinal sides, and wherein the engage-behind contours supportthe groove cover towards the rotational axis and hold the groove coverin the respective groove wherein the method comprises: introducing atleast one groove cover into the rotor receptacle and moving the groovecover into the groove in a movement direction radially to the rotationalaxis of the rotor, with the transverse spacing of the longitudinal sidesof the groove cover being modified in such a way that the groove coverengages behind the engage-behind contours of the groove past theengage-behind contours of the groove into the groove and on thelongitudinal sides.
 22. The method as claimed in claim 21, furthercomprising unwinding a roll material from a coil and severing a lengthof the roll material for providing the at least one groove cover. 23.The method as claimed in claim 21, further comprising thermal deforminga portion of the roll material provided for producing the groove coverin a linear elongated form.